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topgre
 Post subject: GRE Problem solving : Averages - Arithmetic Mean
PostPosted: Sat Jul 25, 2009 11:01 am 
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The average (arithmetic mean) of x and y is 30. If z = 10, then what is the average of x, y, and z?
A. 13 1/3
B. 21 1/4
C. 23 1/3
D. 21 1/3
E. 22 1/4

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urpalvenki
 Post subject: Re: GRE Problem solving : Averages - Arithmetic Mean
PostPosted: Thu Jul 30, 2009 12:12 am 
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The answer is C. 23 1/3

The sum of x and y comes to 60 from the mean...
Adding z the total becomes 70 and on dividing by 3 we get the answer...
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target1500
 Post subject: Re: GRE Problem solving : Averages - Arithmetic Mean
PostPosted: Thu Aug 06, 2009 7:37 pm 
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(x + y)/2 = 30
So, x + y = 60
z =10. So, x + y + z = 60 + 10 = 70

Averages of x, y, z = (x + y+ z)/3 = 70/3

Answer C. 231/3
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